George Segal as Quiller

Alec Guinness as Pol

Max von Sydow as Oktober

Senta Berger as Inge Lindt

George Sanders as Gibbs

Robert Helpmann as Weng

Robert Flemyng as Rushington

Peter Carsten as Hengel

Ernst Walder as Grauber

Edith Schneider as Headmistress

Philip Madoc as Oktober's Man

Herbert Fux as Oktobers Gefolgsmann

Herbert Stass as Kenneth Lindsay Jones

Günter Meisner as Hassler

John Rees as Oktober's Man

Bernard Barnsley as Mr. 'F' (Uncredited)

Victor Beaumont as Weiss (Uncredited)

Otto Friese as Waiter (Uncredited)

Paul Hansard as Doctor Loewe (Uncredited)

Philo Hauser as Night Porter (Uncredited)

John Moulder-Brown as Pupil with Inge (Uncredited)

Hans Schwarz Jr. as Barman (Uncredited)

Claus Tinney as Hughes (Uncredited)